Android 实战项目 -- 登录主页、找回密码-阿里云开发者社区

分析

登录方式

用户名与密码组合登录

手机号与验证码组合登录

以上登录方式的区别

密码输入框和验证码输入框的左侧标题以及输入框内部的提示语各不相同

如果是密码登录，则需要支持找回密码；如果是验证码登录，则需要支持向用户手机发送验证码；

密码登录可以提供记住密码功能，而验证码的数值每次都不一样，无需也没法记住验证码

找回密码

如果用户忘记密码，则需跳到单独的找回密码页面，在该页面输入和确认新密码，并校验找回密码的合法性（通过短信验证码检查）

界面设计

单选按钮 RadioButton：用来区分是密码登录还是验证码登录。

文本视图 TextView：输入框左侧要显示此处应该输入什么信息。

编辑框 EditText：用来输入手机号码、密码和验证码。

复选框 CheckBox：用于判断是否记住密码。

按钮 Button：包含登录、忘记密码和获取验证码三个按钮。

线性布局 LinearLayout：界面从上往下排列，用到了垂直方向的线性布局。

相对布局 RelativeLayout：忘记密码的按钮与密码输入框是叠加的，且“忘记密码”与上级视图右对齐。

单选组 RadioGroup：放置密码登录和验证码登录这两个单选按钮。

提醒对话框 AlertDialog：通过提醒对话框向用户反馈结果

参数传递

整个登录模块由登录页面和找回密码页面组成，因此这两个页面之间需要进行数据交互

从登录页面跳到找回密码页面，要携带唯一标识的手机号码作为请求参数；
从找回密码页面回到登录页面，要将修改之后的新密码作为应答参数传回去

展示：

资源配置文件

drwable 目录下添加已下几个文件：

1、 edittext_select.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_focused="true" android:drawable="@drawable/shape_edit_focus"/>
    <item android:state_focused="false" android:drawable="@drawable/shape_edit_nofocus"/>
</selector>

2、shape_circular.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <!--指定形状内部的填充颜色-->
    <solid android:color="@color/greyc"/>
    <!--指定形状轮廓（边框大小、颜色）的颜色-->
    <stroke
        android:width="2dp"
        android:color="@color/grey"
        />
    <!--指定圆角半径-->
    <corners android:radius="5dp"/>
</shape>

3、checkbox.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/no_remrmber_password" android:state_checked="true" />
    <item android:drawable="@drawable/no_remrmber_password" />
</selector>

按钮图片：

no_remrmber_password.png：

yes_remrmber_password.png：

常量配置文件

value 目录下

1、themes.xml

取消Button系统自带的样式设置

<resources xmlns:tools="http://schemas.android.com/tools">
    <!-- Base application theme. -->
    <style name="Theme.IntermediateControl" parent="Theme.MaterialComponents.DayNight.DarkActionBar.Bridge">
        <!-- Primary brand color. -->
        <item name="colorPrimary">@color/purple_500</item>
        <item name="colorPrimaryVariant">@color/purple_700</item>
        <item name="colorOnPrimary">@color/white</item>
        <!-- Secondary brand color. -->
        <item name="colorSecondary">@color/teal_200</item>
        <item name="colorSecondaryVariant">@color/teal_700</item>
        <item name="colorOnSecondary">@color/black</item>
        <!-- Status bar color. -->
        <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
        <!-- Customize your theme here. -->
    </style>
</resources>

2、strings.xml

<resources>
    <string name="app_name">找回密码</string>
    <string name="login_by_password">密码登录</string>
    <string name="login_by_verifycode">验证码登录</string>
    <string name="phone_number">手机号码：</string>
    <string name="input_phone_number">请输入手机号码</string>
    <string name="login_password">登录密码：</string>
    <string name="input_password">请输入密码</string>
    <string name="forget_password">忘记密码</string>
    <string name="remember_password">记住密码</string>
    <string name="login">登&#160; &#160; &#160; 录</string>
    <string name="input_new_password">输入新密码：</string>
    <string name="input_new_password_hint">请输入新密码</string>
    <string name="confirm_new_password">确认新密码：</string>
    <string name="input_new_password_again">请再次输入新密码</string>
    <string name="verifycode">&#160; &#160; 验证码：</string>
    <string name="verifycode2">&#160; &#160; &#160; &#160; 验证码：</string>
    <string name="input_verifycode">请输入验证码</string>
    <string name="get_verifycode">获取验证码</string>
    <string name="done">确&#160; &#160; &#160;定</string>
</resources>

3、colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="purple_200">#FFBB86FC</color>
    <color name="purple_500">#FF6200EE</color>
    <color name="purple_700">#FF3700B3</color>
    <color name="teal_200">#FF03DAC5</color>
    <color name="teal_700">#FF018786</color>
    <color name="black">#FF000000</color>
    <color name="white">#FFFFFFFF</color>
    <color name="xian_green">#058531</color>
    <color name="grey">#666666</color>
    <color name="greyc">#CCCCCC</color>
    <color name="yellow">#FFFF00</color>
    <color name="red">#FF0033</color>
    <color name="blue">#0066CC</color>
    <color name="green">#33CC33</color>
    <color name="gold">#FFDD66</color>
    <color name="main_page">#CCFFFF</color>
</resources>

4、dimens.xml

宽高变量

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <dimen name="common_font_size">20sp</dimen>
    <dimen name="common_width">150sp</dimen>
    <dimen name="button_font_size">20sp</dimen>
    <dimen name="button_height">35sp</dimen>
    <dimen name="item_layout_height">50dp</dimen>
    <dimen name="margin_top">10dp</dimen>
</resources>

5、AndroidManifest.xml

清单资源文件（启动的Java类）

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.intermediatecontrol">
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.IntermediateControl">
        <activity
            android:name=".LoginForgetActivity"
            android:exported="true" />
        <activity
            android:name=".LoginMainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

布局文件

1、activity_login_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="10dp"
    android:background="@color/main_page">
    <RadioGroup
        android:id="@+id/rg_login"
        android:layout_width="match_parent"
        android:layout_height="@dimen/item_layout_height"
        android:layout_margin="5dp"
        android:orientation="horizontal"
        android:padding="2dp">
        <RadioButton
            android:id="@+id/rb_password"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:text="@string/login_by_password"
            android:textSize="@dimen/common_font_size" />
        <RadioButton
            android:id="@+id/rb_verifycode"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:text="@string/login_by_verifycode"
            android:textSize="@dimen/common_font_size" />
    </RadioGroup>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="@dimen/item_layout_height"
        android:layout_margin="5dp"
        android:orientation="horizontal">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center"
            android:text="@string/phone_number"
            android:textColor="@color/black"
            android:textSize="@dimen/common_font_size" />
        <EditText
            android:id="@+id/et_phone"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_marginTop="5dp"
            android:layout_marginBottom="5dp"
            android:layout_weight="1"
            android:background="@drawable/edittext_select"
            android:hint="@string/input_phone_number"
            android:inputType="number"
            android:maxLength="11"
            android:textColor="@color/black"
            android:textColorHint="@color/grey"
            android:textSize="@dimen/common_font_size" />
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="@dimen/item_layout_height"
        android:layout_margin="5dp"
        android:orientation="horizontal">
        <TextView
            android:id="@+id/tv_password"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center"
            android:text="@string/login_password"
            android:textColor="@color/black"
            android:textSize="@dimen/common_font_size" />
        <RelativeLayout
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1">
            <EditText
                android:id="@+id/et_password"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_marginTop="5dp"
                android:layout_marginBottom="5dp"
                android:layout_weight="1"
                android:background="@drawable/edittext_select"
                android:hint="@string/input_password"
                android:inputType="numberPassword"
                android:maxLength="11"
                android:textColor="@color/black"
                android:textColorHint="@color/grey"
                android:textSize="@dimen/common_font_size" />
        </RelativeLayout>
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="@dimen/item_layout_height"
        android:layout_margin="5dp"
        android:orientation="horizontal">
        <CheckBox
            android:id="@+id/ck_remember"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:button="@drawable/checkbox"
            android:text="@string/remember_password"
            android:textColor="@color/black"
            android:textSize="@dimen/common_font_size" />
        <Button
            android:id="@+id/btn_forget"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_alignParentEnd="true"
            android:background="@drawable/shape_circular"
            android:layout_weight="1"
            android:text="@string/forget_password"
            android:textColor="@color/black"
            android:textSize="@dimen/common_font_size" />
    </LinearLayout>
    <Button
        android:id="@+id/btn_login"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="5dp"
        android:text="@string/login"
        android:textColor="@color/black"
        android:background="@drawable/shape_circular"
        android:textSize="@dimen/button_font_size" />
</LinearLayout>

2、activity_login_forget.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@color/main_page">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="@dimen/item_layout_height"
        android:layout_margin="10dp"
        android:orientation="horizontal">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center"
            android:text="@string/input_new_password"
            android:textColor="@color/black"
            android:textSize="@dimen/common_font_size" />
        <EditText
            android:id="@+id/et_password_first"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@drawable/edittext_select"
            android:hint="@string/input_new_password_hint"
            android:inputType="numberPassword"
            android:maxLength="11"
            android:textColor="@color/black"
            android:textColorHint="@color/grey"
            android:textSize="@dimen/common_font_size" />
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="@dimen/item_layout_height"
        android:layout_margin="10dp"
        android:orientation="horizontal">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center"
            android:text="@string/confirm_new_password"
            android:textColor="@color/black"
            android:textSize="@dimen/common_font_size" />
        <EditText
            android:id="@+id/et_password_second"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@drawable/edittext_select"
            android:hint="@string/input_new_password_again"
            android:inputType="numberPassword"
            android:maxLength="11"
            android:textColor="@color/black"
            android:textColorHint="@color/grey"
            android:textSize="@dimen/common_font_size" />
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="@dimen/item_layout_height"
        android:layout_margin="10dp"
        android:orientation="horizontal">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center"
            android:text="@string/verifycode2"
            android:textColor="@color/black"
            android:textSize="@dimen/common_font_size" />
        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:layout_marginTop="@dimen/margin_top">
            <EditText
                android:id="@+id/et_verifycode"
                android:layout_width="@dimen/common_width"
                android:layout_height="wrap_content"
                android:background="@drawable/edittext_select"
                android:hint="@string/input_verifycode"
                android:inputType="numberPassword"
                android:maxLength="11"
                android:textColor="@color/black"
                android:textColorHint="@color/grey"
                android:textSize="@dimen/common_font_size" />
            <Button
                android:id="@+id/btn_verifycode"
                android:layout_width="wrap_content"
                android:layout_height="@dimen/button_height"
                android:layout_alignParentEnd="true"
                android:layout_marginLeft="20dp"
                android:text="@string/get_verifycode"
                android:background="@drawable/shape_circular"
                android:textColor="@color/black"
                android:textSize="@dimen/common_font_size" />
        </LinearLayout>
    </LinearLayout>
    <Button
        android:id="@+id/btn_confirm"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:text="@string/done"
        android:textColor="@color/black"
        android:background="@drawable/shape_circular"
        android:textSize="@dimen/button_font_size" />
</LinearLayout>

逻辑程序文件

1、LoginMainActivity.java

package com.example.datastorage;
import androidx.activity.result.ActivityResult;
import androidx.activity.result.ActivityResultCallback;
import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.appcompat.app.AppCompatActivity;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextUtils;
import android.text.TextWatcher;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;
import com.example.datastorage.util.ViewUtil;
import java.util.Random;
public class LoginMainActivity extends AppCompatActivity implements RadioGroup.OnCheckedChangeListener, View.OnClickListener, View.OnFocusChangeListener {
    private TextView tv_password;
    private EditText et_password;
    private Button btn_forget;
    private CheckBox ck_remember;
    private EditText et_phone;
    private RadioButton rb_password;
    private RadioButton rb_verifycode;
    private ActivityResultLauncher<Intent> register;
    private Button btn_login;
    private String mPassword = "123456";
    private String mVerifyCode;
    private SharedPreferences preferences;
    public LoginMainActivity() {
        super();
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login_main);
        //给rg_login设置单选监听器
        RadioGroup rb_login = findViewById(R.id.rg_login);
        tv_password = findViewById(R.id.tv_password);
        et_phone = findViewById(R.id.et_phone);
        et_password = findViewById(R.id.et_password);
        btn_forget = findViewById(R.id.btn_forget);
        ck_remember = findViewById(R.id.ck_remember);
        rb_password = findViewById(R.id.rb_password);
        rb_verifycode = findViewById(R.id.rb_verifycode);
        btn_login = findViewById(R.id.btn_login);
        // 给rg_login设置单选监听器
        rb_login.setOnCheckedChangeListener(this);
        // 给et_phone添加文本变更监听器
        et_phone.addTextChangedListener(new HideTextWatcher(et_phone, 11));
        // 给et_password添加文本变更监听器
        et_password.addTextChangedListener(new HideTextWatcher(et_password, 6));
        //提示手机号码错误
        et_password.setOnFocusChangeListener(this);
        btn_forget.setOnClickListener(this);
        btn_login.setOnClickListener(this);
        register = registerForActivityResult(new ActivityResultContracts.StartActivityForResult(), new ActivityResultCallback<ActivityResult>() {
            @Override
            public void onActivityResult(ActivityResult result) {
                Intent intent = result.getData();
                if (intent != null && result.getResultCode() == Activity.RESULT_OK) {
                    // 用户密码已改为新密码，故更新密码变量
                    mPassword = intent.getStringExtra("new_password");
                }
            }
        });
        //记住密码
        preferences = getSharedPreferences("config", Context.MODE_PRIVATE);
        reload();
    }
    private void reload() {
        boolean isRemember = preferences.getBoolean("isRemember", false);
        if (isRemember) {
            String phone = preferences.getString("phone", "");
            et_phone.setText(phone);
            String password = preferences.getString("password", "");
            et_password.setText(password);
            ck_remember.setChecked(true);
        }
    }
    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        switch (checkedId) {
            // 选择了密码登录
            case R.id.rb_password:
                tv_password.setText(getString(R.string.login_password));
                et_password.setHint(getString(R.string.input_password));
                btn_forget.setText(getString(R.string.forget_password));
                ck_remember.setVisibility(View.VISIBLE);
                break;
            // 选择了验证码登录
            case R.id.rb_verifycode:
                tv_password.setText(getString(R.string.verifycode));
                et_password.setHint(getString(R.string.input_verifycode));
                btn_forget.setText(getString(R.string.get_verifycode));
                ck_remember.setVisibility(View.GONE);
                break;
        }
    }
    @Override
    public void onClick(View v) {
        String phone = et_phone.getText().toString();
        if (phone.length() < 11) {
            Toast.makeText(this, "请输入正确的手机号", Toast.LENGTH_SHORT).show();
            return;
        }
        switch (v.getId()) {
            case R.id.btn_forget:
                // 选择了密码方式校验，此时要跳到找回密码页面
                if (rb_password.isChecked()) {
                    // 以下携带手机号码跳转到找回密码页面
                    Intent intent = new Intent(this, LoginForgetActivity.class);
                    intent.putExtra("phone", phone);
                    register.launch(intent);
                } else if (rb_verifycode.isChecked()) {
                    // 生成六位随机数字的验证码
                    mVerifyCode = String.format("%06d", new Random().nextInt(999999));
                    // 以下弹出提醒对话框，提示用户记住六位验证码数字
                    AlertDialog.Builder buider = new AlertDialog.Builder(this);
                    buider.setTitle("请记住验证码");
                    buider.setMessage("手机号" + phone + ",本次验证码是" + mVerifyCode + ",请输入验证码");
                    buider.setPositiveButton("确定", null);
                    AlertDialog dialog = buider.create();
                    dialog.show();
                }
                break;
            case R.id.btn_login:
                // 密码方式校验
                if (rb_password.isChecked()) {
                    if (!mPassword.equals(et_password.getText().toString())) {
                        Toast.makeText(this, "请输入正确的密码", Toast.LENGTH_SHORT).show();
                        return;
                    }
                    // 提示用户登录成功
                    loginSuccess();
                } else if (rb_verifycode.isChecked()) {
                    // 验证码方式校验
                    if (!mVerifyCode.equals(et_password.getText().toString())) {
                        Toast.makeText(this, "请输入正确的验证码", Toast.LENGTH_SHORT).show();
                        return;
                    }
                    // 提示用户登录成功
                    loginSuccess();
                }
                break;
        }
    }
    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        if (hasFocus) {
            String phone = et_phone.getText().toString();
            //提示手机号码不足11位
            if (TextUtils.isEmpty(phone) || phone.length() < 11) {
                et_phone.requestFocus();
                Toast.makeText(this, "请输入11位手机号码", Toast.LENGTH_SHORT).show();
            }
        }
    }
    private class HideTextWatcher implements TextWatcher {
        private EditText mView;
        private int mMaxLength;
        public HideTextWatcher(EditText v, int maxLength) {
            this.mView = v;
            this.mMaxLength = maxLength;
        }
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }
        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
        }
        @Override
        public void afterTextChanged(Editable s) {
            if (s.toString().length() == mMaxLength) {
                // 隐藏输入法软键盘
                ViewUtil.hideOneInputMethod(LoginMainActivity.this, mView);
            }
        }
    }
    // 校验通过，登录成功
    private void loginSuccess() {
        String desc = String.format("您的手机号码是%s，恭喜你通过登录验证，点击“确定”按钮返回上个页面",
                et_phone.getText().toString());
        // 以下弹出提醒对话框，提示用户登录成功
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("登录成功");
        builder.setMessage(desc);
        builder.setPositiveButton("确定返回", (dialog, which) -> {
            // 结束当前的活动页面
            finish();
        });
        builder.setNegativeButton("我再看看", null);
        AlertDialog dialog = builder.create();
        dialog.show();
        if (ck_remember.isChecked()) {
            SharedPreferences.Editor editor = preferences.edit();
            editor.putString("phone", et_phone.getText().toString());
            editor.putString("password", et_password.getText().toString());
            editor.putBoolean("isRemember", ck_remember.isChecked());
            editor.commit();
        }
    }
}

2、LoginForgetActivity.java

package com.example.intermediatecontrol;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import java.util.Random;
public class LoginForgetActivity extends AppCompatActivity implements View.OnClickListener {
    private String mPhone;
    private String mVerifyCode;
    private EditText et_password_first;
    private EditText et_password_second;
    private EditText et_verifycode;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login_forget);
        et_password_first = findViewById(R.id.et_password_first);
        et_password_second = findViewById(R.id.et_password_second);
        et_verifycode = findViewById(R.id.et_verifycode);
        // 从上一个页面获取要修改密码的手机号码
        mPhone = getIntent().getStringExtra("phone");
        findViewById(R.id.btn_verifycode).setOnClickListener(this);
        findViewById(R.id.btn_confirm).setOnClickListener(this);
    }
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btn_verifycode:
                // 点击了“获取验证码”按钮
                // 生成六位随机数字的验证码
                mVerifyCode = String.format("%06d", new Random().nextInt(999999));
                // 以下弹出提醒对话框，提示用户记住六位验证码数字
                AlertDialog.Builder buider = new AlertDialog.Builder(this);
                buider.setTitle("请记住验证码");
                buider.setMessage("手机号" + mPhone + ",本次验证码是" + mVerifyCode + ",请输入验证码");
                buider.setPositiveButton("好的", null);
                AlertDialog dialog = buider.create();
                dialog.show();
                break;
            case R.id.btn_confirm:
                // 点击了“确定”按钮
                String password_first = et_password_first.getText().toString();
                String password_second = et_password_second.getText().toString();
                if (password_first.length() < 6) {
                    Toast.makeText(this, "请输入正确的密码", Toast.LENGTH_SHORT).show();
                    return;
                }
                if (!password_first.equals(password_second)) {
                    Toast.makeText(this, "两次输入的新密码不一致", Toast.LENGTH_SHORT).show();
                    return;
                }
                if (!mVerifyCode.equals(et_verifycode.getText().toString())) {
                    Toast.makeText(this, "请输入正确的验证码", Toast.LENGTH_SHORT).show();
                    return;
                }
                Toast.makeText(this, "密码修改成功", Toast.LENGTH_SHORT).show();
                // 以下把修改好的新密码返回给上一个页面
                Intent intent = new Intent();
                intent.putExtra("new_password", password_first);
                setResult(Activity.RESULT_OK, intent);
                finish();
                break;
        }
    }
}

工具类

util / ViewUtil.java

package com.example.intermediatecontrol.util;
import android.app.Activity;
import android.content.Context;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
public class ViewUtil {
    public static void hideOneInputMethod(Activity act, View v) {
        // 从系统服务中获取输入法管理器
        InputMethodManager imm = (InputMethodManager) act.getSystemService(Context.INPUT_METHOD_SERVICE);
        // 关闭屏幕上的输入法软键盘
        imm.hideSoftInputFromWindow(v.getWindowToken(), 0);
    }
}

优化记住密码

LoginSQLiteActivity.java

package com.example.datastorage;
import androidx.activity.result.ActivityResult;
import androidx.activity.result.ActivityResultCallback;
import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;
import com.example.datastorage.database.LoginDBHelper;
import com.example.datastorage.enity.LoginInfo;
import com.example.datastorage.util.ViewUtil;
import java.util.Random;
public class LoginSQLiteActivity extends AppCompatActivity implements RadioGroup.OnCheckedChangeListener, View.OnClickListener, View.OnFocusChangeListener {
    private TextView tv_password;
    private EditText et_password;
    private Button btn_forget;
    private CheckBox ck_remember;
    private EditText et_phone;
    private RadioButton rb_password;
    private RadioButton rb_verifycode;
    private ActivityResultLauncher<Intent> register;
    private Button btn_login;
    private String mPassword = "123456";//正确密码
    private String mVerifyCode;
    private SharedPreferences preferences;
    private LoginDBHelper mHelper;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login_main);
        RadioGroup rb_login = findViewById(R.id.rg_login);
        tv_password = findViewById(R.id.tv_password);
        et_phone = findViewById(R.id.et_phone);
        et_password = findViewById(R.id.et_password);
        btn_forget = findViewById(R.id.btn_forget);
        ck_remember = findViewById(R.id.ck_remember);
        rb_password = findViewById(R.id.rb_password);
        rb_verifycode = findViewById(R.id.rb_verifycode);
        btn_login = findViewById(R.id.btn_login);
        // 给rg_login设置单选监听器
        rb_login.setOnCheckedChangeListener(this);
        // 给et_phone添加文本变更监听器
        et_phone.addTextChangedListener(new HideTextWatcher(et_phone, 11));
        // 给et_password添加文本变更监听器
        et_password.addTextChangedListener(new HideTextWatcher(et_password, 6));
        btn_forget.setOnClickListener(this);
        btn_login.setOnClickListener(this);
        register = registerForActivityResult(new ActivityResultContracts.StartActivityForResult(), new ActivityResultCallback<ActivityResult>() {
            @Override
            public void onActivityResult(ActivityResult result) {
                Intent intent = result.getData();
                if (intent != null && result.getResultCode() == Activity.RESULT_OK) {
                    // 用户密码已改为新密码，故更新密码变量
                    mPassword = intent.getStringExtra("new_password");
                }
            }
        });
        et_password.setOnFocusChangeListener(this);
    }
    //进入页面后把信息显示出来
    private void reload() {
        LoginInfo info = mHelper.queryTop();
        if (info != null && info.remember) {
            et_phone.setText(info.phone);
            et_password.setText(info.password);
            ck_remember.setChecked(true);
        }
    }
    @Override
    protected void onStart() {
        super.onStart();
        mHelper = LoginDBHelper.getInstance(this);
        mHelper.openReadLink();
        mHelper.openWriteLink();
        reload();
    }
    @Override
    protected void onStop() {
        super.onStop();
        mHelper.closeLink();
    }
    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        switch (checkedId) {
            // 选择了密码登录
            case R.id.rb_password:
                tv_password.setText(getString(R.string.login_password));
                et_password.setHint(getString(R.string.input_password));
                btn_forget.setText(getString(R.string.forget_password));
                ck_remember.setVisibility(View.VISIBLE);
                break;
            // 选择了验证码登录
            case R.id.rb_verifycode:
                tv_password.setText(getString(R.string.verifycode));
                et_password.setHint(getString(R.string.input_verifycode));
                btn_forget.setText(getString(R.string.get_verifycode));
                ck_remember.setVisibility(View.GONE);
                break;
        }
    }
    @Override
    public void onClick(View v) {
        String phone = et_phone.getText().toString();
        if (phone.length() < 11) {
            Toast.makeText(this, "请输入正确的手机号", Toast.LENGTH_SHORT).show();
            return;
        }
        switch (v.getId()) {
            case R.id.btn_forget:
                // 选择了密码方式校验，此时要跳到找回密码页面
                if (rb_password.isChecked()) {
                    // 以下携带手机号码跳转到找回密码页面
                    Intent intent = new Intent(this, LoginForgetActivity.class);
                    intent.putExtra("phone", phone);
                    register.launch(intent);
                } else if (rb_verifycode.isChecked()) {
                    // 生成六位随机数字的验证码
                    mVerifyCode = String.format("%06d", new Random().nextInt(999999));
                    // 以下弹出提醒对话框，提示用户记住六位验证码数字
                    AlertDialog.Builder buider = new AlertDialog.Builder(this);
                    buider.setTitle("请记住验证码");
                    buider.setMessage("手机号" + phone + ",本次验证码是" + mVerifyCode + ",请输入验证码");
                    buider.setPositiveButton("好的", null);
                    AlertDialog dialog = buider.create();
                    dialog.show();
                }
                break;
            case R.id.btn_login:
                // 密码方式校验
                if (rb_password.isChecked()) {
                    if (!mPassword.equals(et_password.getText().toString())) {
                        Toast.makeText(this, "请输入正确的密码", Toast.LENGTH_SHORT).show();
                        return;
                    }
                    // 提示用户登录成功
                    loginSuccess();
                } else if (rb_verifycode.isChecked()) {
                    // 验证码方式校验
                    if (!mVerifyCode.equals(et_password.getText().toString())) {
                        Toast.makeText(this, "请输入正确的验证码", Toast.LENGTH_SHORT).show();
                        return;
                    }
                    // 提示用户登录成功
                    loginSuccess();
                }
                break;
        }
    }
    // 校验通过，登录成功
    private void loginSuccess() {
        String desc = String.format("您的手机号码是%s，恭喜你通过登录验证，点击“确定”按钮返回上个页面",
                et_phone.getText().toString());
        // 以下弹出提醒对话框，提示用户登录成功
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("登录成功");
        builder.setMessage(desc);
        builder.setPositiveButton("确定返回", (dialog, which) -> {
            // 结束当前的活动页面
            finish();
        });
        builder.setNegativeButton("我再看看", null);
        AlertDialog dialog = builder.create();
        dialog.show();
        // 保存到数据库
        LoginInfo info = new LoginInfo();
        info.phone = et_phone.getText().toString();
        info.password = et_password.getText().toString();
        info.remember = ck_remember.isChecked();
        mHelper.save(info);
    }
    // 当密码输入框获取焦点之后，根据输入的电话号码，查询出对应的密码，自动填入
    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        if (v.getId() == R.id.et_password && hasFocus) {
            LoginInfo info = mHelper.queryByPhone(et_phone.getText().toString());
            // 如果根据电话号码，查询出了密码
            if (info != null) {
                et_password.setText(info.password);
                ck_remember.setChecked(info.remember);
            } else {
                // 没有查到，清空密码
                et_password.setText("");
                ck_remember.setChecked(false);
            }
        }
    }
    // 定义一个编辑框监听器，在输入文本达到指定长度时自动隐藏输入法
    private class HideTextWatcher implements TextWatcher {
        private EditText mView;
        private int mMaxLength;
        public HideTextWatcher(EditText v, int maxLength) {
            this.mView = v;
            this.mMaxLength = maxLength;
        }
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }
        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
        }
        @Override
        public void afterTextChanged(Editable s) {
            if (s.toString().length() == mMaxLength) {
                // 隐藏输入法软键盘
                ViewUtil.hideOneInputMethod(LoginSQLiteActivity.this, mView);
            }
        }
    }
}

LoginInfo.java

package com.example.datastorage.enity;
/**
 * 登录实体类
 */
public class LoginInfo {
    public int id;
    public String phone;
    public String password;
    public boolean remember = false;
    public LoginInfo(){}
    public LoginInfo(String phone, String password, boolean remember) {
        this.phone = phone;
        this.password = password;
        this.remember = remember;
    }
    @Override
    public String toString() {
        return "LoginInfo{" +
                "id=" + id +
                ", phone='" + phone + '\'' +
                ", password='" + password + '\'' +
                ", remember=" + remember +
                '}';
    }
}

LoginDBHelper.java

package com.example.datastorage.database;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import com.example.datastorage.enity.LoginInfo;
public class LoginDBHelper extends SQLiteOpenHelper {
    private static final String DB_NAME = "login.db";
    private static final String TABLE_NAME = "login_info";
    private static final int DB_VERSION = 1;
    private static LoginDBHelper mHelper = null;
    private SQLiteDatabase mRDB = null;
    private SQLiteDatabase mWDB = null;
    private LoginDBHelper(Context context) {
        super(context, DB_NAME, null, DB_VERSION);
    }
    // 利用单例模式获取数据库帮助器的唯一实例
    public static LoginDBHelper getInstance(Context context) {
        if (mHelper == null) {
            mHelper = new LoginDBHelper(context);
        }
        return mHelper;
    }
    // 打开数据库的读连接
    public SQLiteDatabase openReadLink() {
        if (mRDB == null || !mRDB.isOpen()) {
            mRDB = mHelper.getReadableDatabase();
        }
        return mRDB;
    }
    // 打开数据库的写连接
    public SQLiteDatabase openWriteLink() {
        if (mWDB == null || !mWDB.isOpen()) {
            mWDB = mHelper.getWritableDatabase();
        }
        return mWDB;
    }
    // 关闭数据库连接
    public void closeLink() {
        if (mRDB != null && mRDB.isOpen()) {
            mRDB.close();
            mRDB = null;
        }
        if (mWDB != null && mWDB.isOpen()) {
            mWDB.close();
            mWDB = null;
        }
    }
    // 创建数据库，执行建表语句
    @Override
    public void onCreate(SQLiteDatabase db) {
        String sql = "CREATE TABLE IF NOT EXISTS " + TABLE_NAME + " (" +
                "_id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL," +
                " phone VARCHAR NOT NULL," +
                " password VARCHAR NOT NULL," +
                " remember INTEGER NOT NULL);";
        db.execSQL(sql);
    }
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    }
    /**
     * 保存账号、密码
     */
    public void save(LoginInfo info) {
        // 如果存在则先删除，再添加
        try {
            //开启事务
            mWDB.beginTransaction();
            delete(info);
            insert(info);
            mWDB.setTransactionSuccessful();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            mWDB.endTransaction();
        }
    }
    /**
     * 根据电话号码进行删除
     *
     * @param info
     * @return
     */
    public long delete(LoginInfo info) {
        return mWDB.delete(TABLE_NAME, "phone=?", new String[]{info.phone});
    }
    /**
     * 新增的手机账号密码（注册）
     *
     * @param info
     * @return
     */
    public long insert(LoginInfo info) {
        ContentValues values = new ContentValues();
        values.put("phone", info.phone);
        values.put("password", info.password);
        values.put("remember", info.remember);
        return mWDB.insert(TABLE_NAME, null, values);
    }
    /**
     * 查询，取最后添加的一条数据
     *
     * @return
     */
    public LoginInfo queryTop() {
        LoginInfo info = null;
        String sql = "select * from " + TABLE_NAME + " where remember = 1 ORDER BY _id DESC limit 1";
        // 执行记录查询动作，该语句返回结果集的游标
        Cursor cursor = mRDB.rawQuery(sql, null);
        if (cursor.moveToNext()) {
            info = new LoginInfo();
            info.id = cursor.getInt(0);
            info.phone = cursor.getString(1);
            info.password = cursor.getString(2);
            info.remember = (cursor.getInt(3) == 0) ? false : true;
        }
        return info;
    }
    /**
     * 根据手机号码查询
     *
     * @param phone
     * @return
     */
    public LoginInfo queryByPhone(String phone) {
        LoginInfo info = null;
        String sql = "select * from " + TABLE_NAME;
        // 执行记录查询动作，该语句返回结果集的游标
        Cursor cursor = mRDB.query(TABLE_NAME, null, "phone=? and remember=1", new String[]{phone},
                null, null, null);
        if (cursor.moveToNext()) {
            info = new LoginInfo();
            info.id = cursor.getInt(0);
            info.phone = cursor.getString(1);
            info.password = cursor.getString(2);
            info.remember = (cursor.getInt(3) == 0) ? false : true;
        }
        return info;
    }
}

Android 实战项目 -- 登录主页、找回密码

分析

界面设计

参数传递

资源配置文件

常量配置文件

布局文件

逻辑程序文件

工具类

优化记住密码

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